docs: def _process_wildtypes(self, limit=None):
          """
          This table provides the genotype IDs, name,
          and abbreviation of the wildtype genotypes.
          These are the typical genomic backgrounds...there's about 20 of them.
          http://zfin.org/downloads/wildtypes_fish.txt
  
          Triples created:
          <genotype id> a GENO:wildtype
          <genotype id> rdfs:label genotype_abbreviation
          <genotype id> dc:description genotype_name
  
          :param limit:
          :return:
  
          """
          if self.test_mode:
              graph = self.testgraph
          else:
              graph = self.graph
          # model = Model(graph)  # unused
          LOG.info("Processing wildtype genotypes")
          line_counter = 0
          geno = Genotype(graph)
          raw = '/'.join((self.rawdir, self.files['wild']['file']))
          with open(raw, 'r', encoding="iso-8859-1") as csvfile:
              filereader = csv.reader(csvfile, delimiter='\t', quotechar='\"')
              for row in filereader:
                  line_counter += 1
                  (fish_num, fish_name, fish_abbreviation, genotype_num
                   # , empty
                  ) = row
                  # ZDB-FISH-150901-10750	INDO	INDO	ZDB-GENO-980210-32
                  fish_id = 'ZFIN:'+fish_num
                  genotype_id = 'ZFIN:' + genotype_num.strip()
                  background_type = self.globaltt['genomic_background']
  
                  # Add genotype to graph with label and description,
                  # as a genomic_background genotype
                  unspecified_background = 'ZDB-GENO-030619-2'
                  if re.match(genotype_num.strip(), unspecified_background):
                      background_type = self.globaltt['unspecified_genomic_background']
                  geno.addGenomicBackground(
                      genotype_id, fish_abbreviation, background_type, fish_name)
  
                  graph.addTriple(fish_id, self.globaltt['has_genotype'], genotype_id)
  
                  # Build the hash for the wild type genotypes.
                  self.id_label_map[genotype_id] = fish_abbreviation
  
                  # store these in a special hash to look up later
                  self.wildtype_genotypes += [genotype_id]
  
                  if not self.test_mode and limit is not None and line_counter > limit:
                      break
  
          LOG.info("Done with wildtype genotypes")
          return